CN-224227230-U - Hydrogen production device by seawater electrolysis

CN224227230UCN 224227230 UCN224227230 UCN 224227230UCN-224227230-U

Abstract

The application discloses a seawater electrolytic hydrogen production device, wherein a hydrophobic and breathable porous membrane is tightly attached to a through hole, liquid seawater is blocked, gaseous water molecules are allowed to pass through, holes corresponding to the hydrophobic membrane are formed in the upper half parts of a cathode conductive sheet and an anode conductive sheet, and a reaction channel is formed in the lower half part of the cathode conductive sheet and the anode conductive sheet. The gel electrolyte is internally provided with a three-dimensional communicating pore canal and permeates into the high-concentration electrolyte solution, and gaseous water molecules in the seawater are driven to migrate into the gel electrolyte in the device through vapor pressure difference. The cathode catalyst contacts with one side of the lower part of the gel electrolyte to catalyze water to generate hydrogen, and the anode catalyst contacts with the other side of the lower part of the gel electrolyte to catalyze hydroxyl to generate oxygen. The gas barrier function of gel electrolysis hydrogen production realizes the independent separation and collection of oxyhydrogen gas at the hydrogen and oxygen outlets. The structure of the seawater electrolysis hydrogen production system is simplified by the functions of liquid seawater blocking by the hydrophobic breathable porous membrane, self-humidification by the gel electrolyte, ion conduction and gas blocking, and the efficient hydrogen production can be directly carried out without seawater desalination.

Inventors

XIE HEPING
TANG WENBIN
ZHAO ZHIYU
LIU TAO

Assignees

四川大学

Dates

Publication Date: 20260512
Application Date: 20250516

Claims (9)

1. The device is characterized by comprising a left shell, a first hydrophobic and breathable porous membrane, a cathode conducting plate, a cathode catalyst, a gel electrolyte, an anode catalyst, an anode conducting plate, a second hydrophobic and breathable porous membrane and a right shell which are arranged from left to right; The first hydrophobic and breathable porous membrane is arranged on the inner side of the upper half part of the left side shell and is tightly attached to the through hole, the second hydrophobic and breathable porous membrane is arranged on the inner side of the upper half part of the right side shell, and the first hydrophobic and breathable porous membrane and the second hydrophobic and breathable porous membrane are tightly attached to the through hole; The upper half part of the cathode conducting plate is provided with holes with the same shape as the first hydrophobic and breathable porous film, the upper half part of the anode conducting plate is provided with holes with the same shape as the second hydrophobic and breathable porous film, and the lower half parts of the cathode conducting plate and the anode conducting plate are provided with reaction channels; the cathode catalyst is contacted with one side of the lower part of the gel electrolyte, and the anode catalyst is contacted with the other side of the lower part of the gel electrolyte; the upper parts of the left shell and the right shell are respectively provided with a through hole for enabling seawater to enter and contact with the hydrophobic and breathable porous membrane; the first hydrophobic and breathable porous membranes are fixed in the shell and separate the seawater from the gel electrolyte so that the gaseous water molecules pass through and block the liquid seawater; A gel electrolyte for driving gaseous water molecules in the seawater to migrate to the inside of the gel electrolyte by a saturated vapor pressure difference; The cathode conducting plate and the cathode catalyst are used for generating hydrogen and hydroxyl by electrolyzing water molecules; An anode catalyst and an anode conductive sheet for electrolyzing hydroxyl to generate oxygen; The lower part of the left shell is provided with a hydrogen outlet which is communicated with the cathode area and is used for discharging and collecting hydrogen; The lower part of the right shell is provided with an oxygen outlet which is communicated with the anode region and is used for discharging and collecting oxygen.
2. The apparatus for producing hydrogen by electrolysis of seawater as claimed in claim 1, wherein the first hydrophobic and the second porous membranes are porous membranes made of polytetrafluoroethylene.
3. The seawater electrolysis hydrogen plant of claim 1, wherein the symmetrically disposed left and right side shells are shells made of corrosion resistant plastic.
4. The seawater electrolysis hydrogen plant of claim 1, wherein the through holes are distributed in an array.
5. The apparatus for producing hydrogen by electrolysis of seawater as claimed in claim 1, wherein the outlets of the hydrogen outlet and the oxygen outlet are provided with anti-reflux valves.
6. The seawater electrolytic hydrogen plant of claim 1, wherein the gel electrolyte is comprised of at least one polymer of polyvinyl alcohol, polyacrylic acid, or polyacrylamide.
7. The apparatus for producing hydrogen by electrolysis of seawater as claimed in claim 1, wherein the gel electrolyte has three-dimensional communicating channels formed by freeze salting out, and potassium hydroxide solution of 20-50wt% is permeated into the channels.
8. The seawater electrolysis hydrogen plant of claim 1, wherein the cathode conductive sheet and the anode conductive sheet are conductive sheets of stainless steel, copper, titanium, or nickel.
9. The seawater electrolysis hydrogen plant of claim 1, wherein the cathode catalyst and anode catalyst are catalysts of platinum or nickel-based composite materials.

Description

Hydrogen production device by seawater electrolysis Technical Field The application relates to the technical field of electrolytic hydrogen production, in particular to a seawater electrolytic hydrogen production device. Background The technology of hydrogen production by electrolysis of water is taken as an important way for clean energy conversion, and the large-scale application of the technology is obviously limited by the acquisition cost of raw materials. Although the ocean environment has rich water resource reserves, the existing electrolytic water hydrogen production system generally adopts pure water as a raw material medium, and the main reason is that the electrolysis of seawater faces multiple technical bottlenecks. Firstly, the multielement ion component rich in seawater can cause electrochemical corrosion of the active site of the electrode catalyst to continuously attenuate the catalytic efficiency, and secondly, insoluble salt precipitation formed on the surface of the ion exchange membrane by metal ions in the electrolysis process can cause membrane pore canal blockage, thereby obviously reducing the proton transmission efficiency and further affecting the running stability of the system. In order to solve the above problems, the prior art generally needs to configure a water treatment device such as multistage reverse osmosis, ion exchange and the like to purify seawater, which not only increases the construction cost of equipment, but also additionally generates pretreatment energy consumption. In addition, when the electrolytic hydrogen production operation is carried out under the ocean dynamic working condition, the mechanical vibration and the wave impact of the ship or the floating platform can cause the unstable flow of fluid in the electrolytic tank. The fluid dynamics disturbance causes potential safety hazards in the first aspect that electrolyte is easy to leak through a sealing interface under the action of pressure pulsation to cause leakage of strong corrosive alkali liquor or acid liquor, and in the second aspect, disordered movement of gas-liquid two-phase flow can aggravate cross mixing of oxyhydrogen gas in an electrode area, and serious explosion risks exist when the concentration of mixed gas reaches an explosion limit. The technical defects seriously restrict the engineering application of the seawater electrolysis hydrogen production technology in the marine environment. Disclosure of utility model The application aims to overcome the defects of the prior art, and provides a seawater electrolytic hydrogen production device, wherein gel electrolyte is used as electrolyte of a seawater direct electrolytic hydrogen production system, gaseous water molecules in the seawater are induced to migrate into the gel through a hydrophobic breathable film, hydroxide ions are conducted to realize an efficient ion passage between a cathode and an anode, oxyhydrogen is effectively separated, and gas crossover is avoided to realize hydrogen production. The aim of the application is achieved by the following technical scheme: In a first aspect, the application provides a seawater electrolytic hydrogen production device, which comprises a left shell, a first hydrophobic and breathable porous membrane, a cathode conducting plate, a cathode catalyst, a gel electrolyte, an anode catalyst, an anode conducting plate, a second hydrophobic and breathable porous membrane and a right shell, wherein the left shell is arranged from left to right; The first hydrophobic and breathable porous membrane is arranged on the inner side of the upper half part of the left side shell and is tightly attached to the through hole, the second hydrophobic and breathable porous membrane is arranged on the inner side of the upper half part of the right side shell, and the first hydrophobic and breathable porous membrane and the second hydrophobic and breathable porous membrane are tightly attached to the through hole; The upper half part of the cathode conducting plate is provided with holes with the same shape as the first hydrophobic and breathable porous film, the upper half part of the anode conducting plate is provided with holes with the same shape as the second hydrophobic and breathable porous film, and the lower half parts of the cathode conducting plate and the anode conducting plate are provided with reaction channels; the cathode catalyst is contacted with one side of the lower part of the gel electrolyte, and the anode catalyst is contacted with the other side of the lower part of the gel electrolyte; the upper parts of the left shell and the right shell are respectively provided with a through hole for enabling seawater to enter and contact with the hydrophobic and breathable porous membrane; the first hydrophobic and breathable porous membranes are fixed in the shell and separate the seawater from the gel electrolyte so that the gaseous water molecules pass through and block the liquid seawater; A g